ButtocksQuadriceps MuscleMuscle, SkeletalHipFlatfishesMusclesElectromyographyElephantsThighPelvisHip JointBiomechanical PhenomenaMuscle ContractionMuscle FatigueMuscle ProteinsMuscle Fibers, SkeletalMuscle WeaknessMuscle StrengthPectenLower ExtremityMuscle, SmoothIsometric ContractionPostureTorqueMuscle, Smooth, VascularKnee